Error CS0234: The type or namespace name
IBitmap\' does not exist in the namespace
Com.Sushi.Hangover\'. Are you missing an assembly reference? >
I've written a smallish guide on this topic that might help in certain areas: https://gist.github.com/JonDouglas/dda6d8ace7d071b0e8cb
In short, you could potentially try changing the visibility like @Cheesebaron has mentioned already: https://gist.github.com/JonDouglas/dda6d8ace7d071b0e8cb#class-visibility (Replace /class with interface or read the common paths)
Otherwise you can potentially try to add the node from scratch: https://gist.github.com/JonDouglas/dda6d8ace7d071b0e8cb#adding-types
For a more exact answer, I believe we would need to see the respective .jar/.aar and the current Bindings project.